﻿#region Copyright

// The contents of this file are subject to the Mozilla Public License
//  Version 1.1 (the "License"); you may not use this file except in compliance
//  with the License. You may obtain a copy of the License at
//  
//  http://www.mozilla.org/MPL/
//  
//  Software distributed under the License is distributed on an "AS IS"
//  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
//  License for the specific language governing rights and limitations under 
//  the License.
//  
//  The Initial Developer of the Original Code is Robert Smyth.
//  Portions created by Robert Smyth are Copyright (C) 2008.
//  
//  All Rights Reserved.

#endregion

using System;
using NUnitGrid.Framework.Logging;


namespace NUnitGrid.Framework.Pipes.States
{
    public class ConnectingState : IPipeState, IScheduledEventListener
    {
        private readonly ILogger logger;
        private readonly IPipeStream namedPipeStream;
        private readonly ISchedule schedule;
        private readonly IStateEngine<IPipeState> stateEngine;
        private readonly IPipeStateFactory stateFactory;
        protected readonly TimeSpan tickPeriod = TimeSpan.FromMilliseconds(25);
        protected bool connectionMade;

        public ConnectingState(IStateEngine<IPipeState> stateEngine, IPipeStateFactory stateFactory, ILogger logger,
                               ISchedule schedule, IPipeStream namedPipeStream)
        {
            this.stateEngine = stateEngine;
            this.stateFactory = stateFactory;
            this.logger = logger;
            this.schedule = schedule;
            this.namedPipeStream = namedPipeStream;
        }

        public void OnEntering()
        {
            logger.Verbose.Write("Waiting for connection (entering connection state)");
            schedule.AddEvent(this, tickPeriod);
            namedPipeStream.Start();
            namedPipeStream.WaitForConnection(OnConnectCallBack);
        }

        public void Connect()
        {
            throw new InvalidOperationException();
        }

        public void SendMessage(string message)
        {
            throw new InvalidOperationException("Cannot send a message when pipe is connecting");
        }

        public void OnReceivedLine(string message)
        {
            throw new InvalidOperationException("Received message while pipe connecting.");
        }

        public void Stop()
        {
            namedPipeStream.Stop();
        }

        void IScheduledEventListener.OnEventFired()
        {
            if (connectionMade)
            {
                connectionMade = false;
                logger.Verbose.Write("Pipe has connected.");
                stateEngine.ChangeState(stateFactory.CreateConnectedState(namedPipeStream));
            }
            else
            {
                schedule.AddEvent(this, tickPeriod);
            }
        }

        private void OnConnectCallBack(bool succeeded)
        {
            connectionMade = true;
        }
    }
}